Translation of "coldness" into Chinese

No matter how cold it is outside, the rooms are comfortably heated.

無論外面多麼寒冷,房間始終既舒適又溫暖。

It is said that Japanese people are kind to people they know, but rather cold to those they don't.

據說日本人對認識的人親切,對不認識的人卻是十分冷淡。

North China is cold in spring, so flowers don't bloom outdoors.

春季的时候,中国北边很冷,所以在外边的花不开花。